Pentair 155355-43 Cartridge Filter 75/25 Micron Polypropylene

Product Description

The PENTAIR 155355-43 is a dual-gradient polypropylene cartridge filter designed for plumbing filtration applications. It measures 4.5 inches in outside diameter and 9.75 inches in length, fitting standard whole-house or point-of-entry filter housings. The dual-gradient construction layers a 75-micron outer zone and a 25-micron inner zone, capturing both large and fine sediment particles in a single pass. This design extends service life by distributing particulate load across the depth of the media rather than concentrating it at one surface. Licensed plumbers and water treatment technicians install this filter in residential and light commercial systems.

This cartridge is suited for residential and light commercial potable water lines, irrigation feed systems, and other plumbing circuits where sediment control is required. The 75/25 dual-gradient micron rating makes it effective against dirt, sand, rust, and similar particulate found in well water and municipal supply lines. It is rated for water temperatures between 40 degrees F and 145 degrees F, covering typical cold and hot supply conditions in most North American installations.

Key Features

• Dual-gradient media: 75-micron outer layer and 25-micron inner layer for staged sediment capture
• Polypropylene construction resists moisture, chemicals, and microbial growth within rated temperature range
• 4.5-inch OD and 9.75-inch length fits standard whole-house filter housings of this size class
• Operating temperature range of 40 degrees F to 145 degrees F suits cold and hot supply lines
• Reduces sediment including dirt, sand, rust, and fine particulate

Compatibility

Designed as an OEM-style replacement cartridge for standard 4.5-inch outside diameter plumbing filter housings accepting 9.75-inch cartridges.

Installation Notes

Installation and replacement should be performed by a licensed plumber or qualified water treatment technician. Shut off the water supply and relieve system pressure before opening the filter housing. Follow local plumbing codes, including IPC guidelines, for installation requirements. Do not exceed the rated maximum temperature of 145 degrees F or the rated micron specifications for the intended application.